Artificial tooth.



H. W. WENZEL.

ARTIFICIAL TOOTH.

APPLICATION FILED JULY 28. 1911..

- 1 ,245343 Patented Nov. 6, 1917.

- INVENTOI? UNITED sranns PATENT oFFIon.

HENRY W. WENZEL, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR '20 H. D. JUS'II & SON, OF PHILADELEHIA, PENNSYLVANIA, A FIRM UOMPOSED OF HENRY D. JUSTI AND HENRY Me JUSTL To all whom it may concern:

Be it known that 1,.HENRY W. WnNznL, a citizen of the United States, residm 1n the city and county of Philadelphia, tate of Pennsylvania, have invented a new and useful Artificial Tooth, of which the followingiis a specification.

y invention relates to an lmprovement in an artificial tooth more partlcularly adapted to vulcanite work, and has for its object the elimination of metallic pins or other devices of the kind as means for attachment to the mouth plate, preventing the formation of air pockets heretofore exlstlng in such plates, as well as providing a strong connection for the tooth with said plate.

The invention is satisfactorily illustrated in the accompanying drawing, but the 1mportant instrumentalities thereof may be varied, and so it is to be understood that the invention is not limited to the specific details shown and described, as long as they are within the spirit or scope of the claim.

Figure 1 represents a side elevation of an artificial tooth embodying my invention.

Fig. 2 represents a planvlew thereof.

Fig. 3 represents a transverse section on line 3-3 Fig. 1.

Fig. 4 represents a diagrammatic view of a number of theteeth in position.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings 1 designates an artificial tooth, the same having thereon on the lingual side thereof the cervical rid e 2.

In the opposite sides of the tooth in the longitudinal direction thereof are the grooves 3 each of which exists between the rear wall 4 of the body of the tooth and the front wall 5 of the cervical ridge'leaving between the latter and said lrmdy the neck 6 which is of reduced width and has in' it the opening or vent 7 which extends transversely therethrough.

The lower ortion of said rear wall 4 of the body 0? the tooth is extended rearwardly forming the ofisets 8 producing shoulders which project partly into the adjacent portions 0 the grooves 3 toward the front wall of the cervical ridge, thus increasing the thickness of the rear portion of the body of the tooth at what may be termed the bases of said grooves above the biting edge of'the tooth below the opening 7, and f Specification of Letters Patent.

Application filed July 28, 1917. Serial No. 183,277.

' edge 9 of the toot evident.

ARTIFICIAL TOOTH.

Patented Nov. 6, 1917.

lie flat against the same, and the shoulders formed by the ofi'sets 8 in said grooves will 1 their length, whereby the plate material will provide additional means for interlocking the tooth with the plate material and so forming a strong connection for said memhere, without the employment of metallic pins or other devices of the class.

Furthermore, in the process primarily of connecting the tooth with the plate, air is permitted to escape through the grooves 3 and opening or vent 7, thus preventing the formation of air pockets in the mouth plate or tooth by the undercuts in the latter, said opening or vent also receiving some of the material of the mouth plate, which being anchored therein adds increased strength to the connection of the tooth with said plate and vice versa. I

I am aware that it is not-new to form ofsets or shoulders on the lower portions of the rear wall of the grooves in the sides of a tooth, the same projecting toward the front walls of said grooves. This leaves said front walls of said grooves unobstructed to the extreme lower ends thereof, whereby the rubber or plate material occupying said grooves extends quite close to the biting In the present construction, however, the portion of the rubber or plate material occupying said grooves will extend to the lower terminals of the rear walls of the ofi'sets 8, whereby a large extent of the rear of the biting portion of the tooth is left uncovered as at 10 for contact of the tongue, the advantages of which in the use of the tooth is Then in the former construction as the plate material extends from the rear ofi'set to the biting edge of the tooth more of such material is required than when the material terminates at the base of the front ofi'set as now located, hence there is a saving of the material in the present construction over the former one. In said former construction the plate material is imposed said portion necessarily thickens the tooth thereat as it is composed of both porcelain and plate material. This is avoided in my case, as the plate material terminates at the base of the front odset as now located and leaves the portion 10 of the rear oi" the tooth uncovered from the biting edge to said base of the front offset avoiding thickening of the tooth at and above the biting portion,

Having thus described my invention What I claim as new and desire to secure by Letters Patent, is

An artificial tooth formed of a body, a

i eeaeea cervical ridge and a reduced neck intermediate of said ridge and body, connectin the 15 same and having a groove in the side 0 said neck between said body and ridge, and an ofiset in said groove on the rear wall of said body, and projecting rearward from said wall partly into sald groove toward the 2d front wall of said cervical ridge HENRY W. WENZEL. Witnesses:

JOHN A. WIEDERsHEIM, N. BUSSINGER. 

